Roman consul and commander, champion lacking aspiration (6)
I believe the answer is:
cicero
'roman consul' is the definition.
(I've seen this before)
'commander champion lacking aspiration' is the wordplay.
'commander' becomes 'CIC' (abbreviation for commander in chief).
'champion lacking aspiration' becomes 'ero' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cic'+'ero'='CICERO'
'and' is the link.
Can you help me to learn more?
(Other definitions for cicero that I've seen before include "Famous Roman orator" , "Orator's" , "Statesman from Rome" , "Old politician" , "accomplished orator" .)